Innovative Design of GFRP Bars for Concrete Structures

2012 ◽  
Vol 457-458 ◽  
pp. 553-556 ◽  
Author(s):  
Ana Almerich-Chulia ◽  
Pedro Martin-Concepcion ◽  
Jose Miguel Molines-Cano ◽  
Juan Rovira-Soler
Keyword(s):  
Mechanical Properties ◽  
Concrete Structures ◽  
Innovative Design ◽  
Gfrp Bars ◽  
Tension And Compression ◽  
Research Situation

This part analyzed GFRP rebar’s research situation, summarized its behaviuor as internal reinforcement for concrete structures. The research has been developed over recent years, however the rules and standard codes for design RC concrete structures with these rebars not consider that the internal reinforcement can work in compression. This paper presents the development of the research to get a new kind GFRP rebar for work as internal reinforcement of concrete structures, with an innovative design for work both in tension and compression, and their mechanical properties: strength, bond,…

Innovative Design of GFRP Bars for Concrete Structures

2012 ◽  
Vol 457-458 ◽  
pp. 553-556
Author(s):  
Ana Isabel Almerich-Chulia ◽  
Pedro Martin-Concepcion ◽  
Jose Miguel Molines-Cano ◽  
Juan Rovira-Soler
Keyword(s):  
Concrete Structures ◽  
Innovative Design ◽  
Gfrp Bars

Fracture patterns and mechanical properties of GFRP bars as internal reinforcement in concrete structures

2020 ◽  
Vol 11 (3) ◽  
pp. 69
Author(s):  
Mehmet Canbaz ◽  
Uğur Albayrak
Keyword(s):  
Mechanical Properties ◽  
Concrete Structures ◽  
Concrete Block ◽  
Glass Fiber Reinforced Plastic ◽  
Gfrp Bars ◽  
Steel Rebar ◽  
Pull Out ◽  
Steel Bars ◽  
Bonding Properties ◽  
Modulus Of Resilience

Glass Fiber Reinforced Plastic (GFRP) composites as rolled bars can be used as steel rebar to prevent oxidation or rust which is one of the main reasons concrete structures deteriorate when exposed to chlorides and other harmful chemicals. GFRP is successful alternative for reinforcement with high tensile strength- low strain, corrosion resistance and congenital electromagnetic neutrality in terms of longer service life. The main goal of the study is to investigate the mechanical and bonding properties of GFRP bars and equivalent steel reinforcing bars then compare them. GFRP and steel rebar are embedded in concrete block with three different levels. Mechanical properties of GFRP and steel bars in terms of strength and strains are determined. On the other hand; modulus of elasticity of GFRP and steel bars, modulus of toughness and modulus of resilience were calculated using stress-strain curves, as a result of the experiments. Pull-out tests are conducted on each GFRP and rebar samples which are embedded in concrete for each embedment level and ultimate adherence strengths are determined in terms of bar diameter–development length ratio. Yield strength, strain and modulus of elasticities of GFRP samples are compared to steel rebar. According to the test results reported in this study, GFRP bars are used safely instead of steel bars in terms of mechanical properties.

Methodology of studying the mechanical properties of composite materials (reinforced concrete)

2018 ◽  
Vol 84 (12) ◽  
pp. 61-67
Author(s):  
V. A. Eryshev
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Experimental Studies ◽  
Analytical Relationship ◽  
Hardened Concrete ◽  
Deformation Model ◽  
Joint Work ◽  
Concrete Shrinkage ◽  
Axial Tension ◽  
Tension And Compression

The mechanical properties of a complex composite material formed by steel and hardened concrete, are studied. A technique of operative quality control of new credible concrete and reinforcement, both in laboratory and field conditions is developed for determination of the strength and strain characteristics of materials, as well as cohesion forces determining their joint operation under load. The design of the mobile unit is presented. The unit provides a possibility of changing the direction of loading and testing the reinforced element of the given shape both for tension and compression. Moreover, the nomenclature of testing equipment and the number of molds for manufacturing concrete samples substantially decrease. Using the values of forcing resulting in concrete cracking when the joint work of concrete and reinforcement is disrupted the values of the inherent stresses and strains attributed to the concrete shrinkage are determined. An analytical relationship between the forces and deformations of the reinforced concrete sample with central reinforcement is derived for axial tension and compression, with allowance for strains and stresses in the reinforcement and concrete resulted from concrete shrinkage. The results of experimental studies are presented, including tension diagrams and diagrams of developing axial deformations with an increase in the load under the central loading of the reinforced elements. A methodology of accounting for stresses and deformations resulted from concrete shrinkage is developed. The applicability of the derived analytical relationships between stresses and deformations on the material diagrams to calculations of the reinforced concrete structures in the framework of the deformation model is estimated.

Verification, Validation and Topology Optimization for Innovative Design of Concrete Structures

2018 ◽  
Vol 56 (9) ◽  
pp. 801-808
Author(s):  
K. Wada ◽  
H. Sakurai ◽  
K. Takimoto ◽  
S. Yamamoto
Keyword(s):  
Topology Optimization ◽  
Concrete Structures ◽  
Innovative Design ◽  
And Topology

Physical, mechanical, and durability characteristics of newly developed thermoplastic GFRP bars for reinforcing concrete structures

2021 ◽  
Vol 276 ◽  
pp. 122200
Author(s):  
Brahim Benmokrane ◽  
Salaheldin Mousa ◽  
Khaled Mohamed ◽  
Mahmoud Sayed-Ahmed
Keyword(s):  
Concrete Structures ◽  
Gfrp Bars

Experimental Research on Strength of GFRP Bars in Shield Engineering

2014 ◽  
Vol 1020 ◽  
pp. 308-313
Author(s):  
Jun Liu ◽  
Hong Zhou ◽  
Hai Jun Yuan ◽  
Jing Fan Li
Keyword(s):  
Mechanical Properties ◽  
Experimental Research ◽  
Security Risks ◽  
Steel Reinforced Concrete ◽  
Retaining Structure ◽  
Supporting Structure ◽  
Gfrp Bars ◽  
The World ◽  
Structure Strength ◽  
Subway Stations

Subway stations or shield wells are often built using steel reinforced concrete supporting structure materials. These concrete retaining structure materials must be destroyed before launching and receiving of shield, so, some security risks may arise during destroying, and time limit for project may be longer, and the structure strength may be weakened; there are the same problems in crossing the existing subsidiary structure. In the supporting structure, concrete supporting structure materials have been partially substituted by GFRP bars in shield engineering in the world. In order to study the mechanical properties of GFRP bars deeply, experimental research on strength of GFRP bars have been made, and some relation shapes between stress and shear strength have been discussed; all of these are expected to make some basis for the design of GFRP concrete in shield engineering.

scholarly journals DETERMINATION OF MECHANICAL PROPERTIES OF REPAIR MORTARS USING IN SITU METHODS UNDER DIFFERENT CURINGS

2020 ◽  
Vol 2 ◽  
pp. 3-18
Author(s):  
Ali Saberi Varzaneh ◽  
Mahmoud Naderi
Keyword(s):  
Mechanical Properties ◽  
Concrete Structures ◽  
High Impact ◽  
Physical Factors ◽  
High Confidence ◽  
In Situ Methods ◽  
Repair Mortars ◽  
Friction Transfer

Considering the differences between environmental conditions of concrete structures and laboratory conditions, it is important to determine the parameters of the materials at the site of the structure. One of these materials is cement-based repair mortars due to the damage of concrete structures that may arise due to chemical or physical factors, these structures are required to be repaired. For this reason, in this paper, to determine the strength of repair mortars of different ages and under different Curing, Situ methods "Friction-Transfer" and "Pull-off" were used and the relationships between the Flexural Compressive, Tensile and readings obtained from the above methods on cementations mortars are presented. Experiments were performed on mortars at ages 3, 7, 28, 42 and 90 days under the conditions of "waterlogging", "Curing Agent" and "releasing in the outdoor". The results show the high impact of the process on the Flexural Compressive, Tensile of the repair mortars and the results of the "Friction-Transfer" and "Pull-off" methods. Also, a high correlation coefficient was obtained between the mechanical properties of the mortars and the results of the above tests; it is possible to measure the mechanical properties of repair mortars in situ with high confidence and in situ

The Innovative Design of New-Style Clamping Automobile Tires Conveyance Based on TRIZ

2011 ◽  
Vol 335-336 ◽  
pp. 69-73 ◽  
Author(s):  
Qin He ◽  
Qian Su ◽  
Ming Qin Zhang ◽  
Rui Jun Zhang ◽  
Sheng Qu
Keyword(s):  
Conceptual Design ◽  
Simple Structure ◽  
Innovative Design ◽  
Bearing Load ◽  
Strength And Stiffness ◽  
Research Situation ◽  
Automobile Tires

Abstract. This part analyzed clamping automobile tires conveyance’s research situation, summarized its failure problem and occurrence cause, and selected the important failure problem by RPN method; and then solved creatively clamping lever roller’s wear, clamping lever’s excessive damage owing to rise and decrease slightly, the automobile conveyance’s excessive damage owing to the car’s rollover and clamping lever’s bearing load unevenly; in the end, proposed the conceptual design of new-style clamping vertically automobile tires conveyance. The conveyance have a simple structure, decrease the clamping lever’s and car tire’s wear, avoid cantilever phenomenon owing to rise and decrease slightly, decrease the clamping lever’s strength and stiffness.

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